.film-item img{
    width: 100px;
    float: left;
}

.film-item {
    overflow: hidden;
    margin: 10px;
}

.film-detail{
    width: 300px;
    height: 300px;
    background-color: skyblue;
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}